Depending on the state you put as option ("master"
or "backup") the script will get all the vrrp enables
interface and check they are in this state.
If not, it will retrun a critical status
By default, it will check Nokia IP platforms using vrrp, you can
test other platforms with the '-T' option :

- Alteon
- Linkproof (VRRP)
- Nokia clustering.

Nokia clustering check

Nokia clustering check does not have a master
& backup state. Instead, the plugin will check :

- The number of cluster member
- The % load on each cluster.

For example -s 2,90 will issue
- A critical level if there is not 2 members.
- A warning level if more than 90% is assigned to one cluster member.